package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import org.springframework.beans.factory.annotation.Value;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     */
    @PostMapping("/upload")
    public R upload(MultipartFile file) {
        //file是一个临时文件,需要转存到指定位置,否则本次请求完成后临时文件会删除
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();//dfhada.jpg
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用uuid重新生成文件名,防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;
        //创建一个目录对象
        File idr = new File(basePath);
        //判断当月目录是否存在
        if (!idr.exists()) {
            //目录不存在,创建目录
            idr.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + File.separator +fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }
/**
 * 文件下载
 * @param name
 * @param response
 */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            FileInputStream stream = new FileInputStream(new File(basePath+File.separator+name));

            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = stream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            stream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
